Add tidelift

Signed-off-by: Bernát Gábor <[email protected]>

Author: gaborbernat

.github/FUNDING.yml

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+tidelift: "pypi/sphinx-argparse-cli"

.github/SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.10 +  | :white_check_mark: |
+| < 1.10  | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift
+will coordinate the fix and disclosure.